Did Millikan deny the existence of cosmic rays?

Answered in Robert Andrews Millikan's voice — an AI synthesis grounded in their documented work, not a quotation.

No, quite the contrary. My extensive work with cosmic rays, particularly my expeditions to high altitudes in California, led me to conclude that these rays were not of terrestrial origin. I proposed that they originated from outer space and were highly energetic particles. My research helped to establish cosmic rays as a significant astrophysical phenomenon, challenging earlier assumptions and opening up new avenues of investigation in physics.

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